Authorities in the San Francisco Bay Area said 14 people have been arrested and all BART trains are running again after a group protesting the grand jury decision in Ferguson, Missouri, chained themselves to trains and interrupted service from Oakland to San Francisco.

BART system spokeswoman Alicia Trost said about 25 people chained themselves Friday and shut down a major station as demonstrations persisted days after jurors declined to indict a white officer in the shooting death of a black 18-year-old.

Trost says about 125 protesters wearing T-shirts reading "Black Lives Matter" gathered at the West Oakland station. She says police have cleared the station and service has restarted.

Oakland protesters have spent days rallying against the jury's decision Monday, some smashing windows of businesses and blocking freeways.